Serichlamys spathulata Reemer, 2025

Reemer, Menno & Mengual, Ximo, 2025, Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae), ZooKeys 1243, pp. 51-106 : 51-106

Serichlamys spathulata Reemer sp. nov.

Figs 41 , 46 , 47 , 51 , 52 , 107–112 , 147

Type material.

Holotype. Brazil • 1 ♂, holotype of Serichlamys spathulata sp. nov.; São Paulo, Salesópolis, Estação Biológica de Boracéia ; 23.652778°S, 43.890833°W; 26 Nov. 2016; Amorim leg.; CNC [ CNC 1059091 ]. Label 1: “ Brazil: Sao Paulo // Salésopolis, Estação // Biológica de Boracéia base // 23.652778°S 43.890833°W // 26. xi. 2016. Amorim & eq // coll. Malaise trap // CNC 1059091 ”; GenBank accession no. PQ 629007 . Paratypes. Brazil • 3 ♂ with same label data as holotype except CNC specimen codes as follows: CNC 1059088 , CNC 1059089 , CNC 1059090 ; GenBank accession no. PQ 629010 , PQ 629014 , PQ 629003 • 1 ♂; Paraná, S. José Pinhais, Ser. Mar. Br 277 Km 54 ; 24 Nov. 1986; Lev. Ent. Profaupar leg.; JTS [M. Reemer specimen code MR 598 ] • 1 ♂; São Paulo, Campos do Jordão ; Dec. 1945; MZUSP • 3 ♂ 1 ♀; São Paulo, Campos do Jordão ; Dec. 1955; MZUSP • 1 ♂; São Paulo, Campos do Jordão ; Dec. 1955; RMNH .

Additional specimens.

Brazil • 1 ♀; São Paulo, São Luis do Paraitinga, PESM, Núcleo Sta. Virginia ; 23.324194°S, 45.094000°W; 20 Nov. 2011; N. W. Perioto leg.; Malaise trap; CNC [ CNC specimen code: CNC 1059092 ]; GenBank accession no. PQ 629006 .

Description

(based on holotype). Adult male Body size: 7 mm.

Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons brown; medially bare, laterally black setulose. Vertex brown; golden yellow setulose. Occiput brown except medially blackish; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna blackish brown, basal 1 / 4 of postpedicel paler; antennal ratio ~ 3: 1: 4.5.

Thorax. Scutum blackish with bronze sheen, margins brown; golden yellow setulose. Postpronotum and postalar callus brown; golden yellow setulose. Scutellum trapezoid, brown; golden yellow setulose; with two dorsoventrally flattened, spoon-shaped calcars as long as ~ 1 / 3 of scutellar length. Pleura brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow.

Wing: hyaline; microtrichose, except bare on narrow strip in cell r 1 along vein RS, most of cell br (only microtrichose along vena spuria), very narrowly along posterior margin of cell bm, and basomedian 1 / 3 of alula.

Legs: pale brown, with femora somewhat darker; yellow to white setulose, except mid and hind femora anteriorly black setulose. Coxae and trochanters brown; yellow to white setulose.

Abdomen. Tergites dark brown, except lateral margins and posterior margins of tergites 3 and 4 paler brown. Tergite 1 white setulose. Tergite 2 largely grey microtrichose, with submedian pair of small, vaguely demarcated shiny maculae; white setulose. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; black setulose on dull parts, white setulose on shiny parts. Tergite 4 semi-shiny; yellowish setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish brown; white setulose. Genitalia as in Fig. 147 .

Female. As male, except for following differences. Body length 10 mm (n = 1). Antenna: scape and pedicel brow, postpedicel blackish. Legs entirely yellowish brown. Tergite 5 dark brown; yellowish setulose laterally and posteriorly, black setulose anteriorly and medially.

Diagnosis.

Body length: male 7–8 mm (n = 10), female 10 mm (n = 1). Together with S. serpentiphallus Reemer , sp. nov. and S. simpliciphallus Reemer , sp. nov., this species belongs to a group of three species of which most (not all!) specimens have dorsoventrally flattened, spoon-shaped calcars on the scutellum (Figs 51–57 ). From both species, as well as from S. mus (Curran) , it differs by the wide fascia of grey microtrichia on tergite 2, with at most a pair of smaller round bare parts laterally (Figs 46 , 47 ). It also differs from the three aforementioned species by the black postpedicel (at most basal 1 / 4 paler). Male genitalia as in Fig. 147 .

Notes.

The distribution of microtrichia on the wing is very variable. For instance, in the holotype cell cup is entirely microtrichose, but in some paratypes it is partly bare. In some specimens the alula is almost entirely microtrichose, while in other ones there is a large bare patch basomedially, and intermediates occur.

Etymology.

The name spathulata is an adjective derived from spatha, the Latin word for spoon. It refers to the spoon-shaped scutellar calcars.

Molecular data.

Five DNA barcodes were obtained for this species, which cluster together in our NJ tree (BS = 100). As sister taxon we recovered Serichlamys sp. ( CNC 1059093) (similarity = 97.264–97.416 %) with high support (BS = 100).

Distribution.

This species is only known from the Brazilian State of São Paulo.

Figures

Figures 36–43. 36, 37 abdomen of Serichlamys males 36 S. trigonoides Reemer, sp. nov. holotype 37 S. mus (Curran, 1936) specimen USNMENT 01866933 (= MR 1587) 38, 39 hind leg of Serichlamys males 38 S. xanthocnemia Reemer, sp. nov. holotype 39 S. simpliciphallus Reemer, sp. nov. holotype 40–43 antenna of Serichlamys males (note that shape of postpedicel may vary within species, with apex acute or rounded) 40 S. mus (Curran, 1936) specimen MR 1587 41 S. spathulata Reemer, sp. nov. holotype 42 S. serpentiphallus Reemer, sp. nov. holotype 43 S. simpliciphallus Reemer, sp. nov. holotype.

Figures 44–49. Tergite 2 of Serichlamys, posterodorsal view. White lines in lower half of figures indicate position of patches of grey microtrichia (vary with viewing angle and lighting to get good view on shiny and dull parts) 44 S. mus (Curran, 1936) male, specimen MR 1587 45 S. mus (Curran, 1936) female, specimen MR 1606 46 S. spathulata Reemer, sp. nov. male, holotype 47 S. spathulata Reemer, sp. nov. female, paratype 48 S. serpentiphallus Reemer, sp. nov. male, holotype 49 S. simpliciphallus Reemer, sp. nov. male, holotype.

Figures 50–57. Scutellar calcars of Serichlamys 50 S. mus (Curran, 1936) male, holotype 51 S. spathulata Reemer, sp. nov. holotype, male 52 S. spathulata Reemer, sp. nov. female, paratype 53 S. serpentiphallus Reemer, sp. nov. male, holotype 54 S. serpentiphallus Reemer, sp. nov. male, paratype 55 S. serpentiphallus Reemer, sp. nov. male, paratype 56 S. simpliciphallus Reemer, sp. nov. male, holotype 57 S. simpliciphallus Reemer, sp. nov. male, paratype 1957 MZUSP.

Figures 107–112. Serichlamys spathulata Reemer, sp. nov. male, holotype 107 habitus, dorsal 108 habitus, lateral 109 head, frontal 110 head, lateral 111 head, dorsal 112 Serichlamys spathulata Reemer, sp. nov. female, paratype: habitus, dorsal.

Figures 146–149. Serichlamys male genitalia (phallus grey-shaded) 146 S. mus (Curran, 1936) coll. USNM, USNMENT 01866933 147 S. spathulata Reemer, sp. nov. coll. JTS, specimen code MR 598 148 S. serpentiphallus Reemer, sp. nov. coll. RMNH, specimen code MR 381 149 S. simpliciphallus Reemer, sp. nov. holotype.